1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2021 Facebook */
3
4#include "vmlinux.h"
5#include <bpf/bpf_helpers.h>
6#include <bpf/bpf_tracing.h>
7
8char _license[] SEC("license") = "GPL";
9
10struct {
11 __uint(type, BPF_MAP_TYPE_TASK_STORAGE);
12 __uint(map_flags, BPF_F_NO_PREALLOC);
13 __type(key, int);
14 __type(value, __u64);
15} task_storage SEC(".maps");
16
17int run_count = 0;
18int valid_ptr_count = 0;
19int null_ptr_count = 0;
20
21SEC("fentry/exit_creds")
22int BPF_PROG(trace_exit_creds, struct task_struct *task)
23{
24 __u64 *ptr;
25
26 ptr = bpf_task_storage_get(&task_storage, task, 0,
27 BPF_LOCAL_STORAGE_GET_F_CREATE);
28 if (ptr)
29 __sync_fetch_and_add(&valid_ptr_count, 1);
30 else
31 __sync_fetch_and_add(&null_ptr_count, 1);
32
33 __sync_fetch_and_add(&run_count, 1);
34 return 0;
35}
36

source code of linux/tools/testing/selftests/bpf/progs/task_local_storage_exit_creds.c